[TenTec] Vertical Dipole "Fringe Benefits"

[Ken Brown]

>A vertical dipole with the feedline coming straight off of the side for at 
>least 1/4 wavelength should have a near prefect circle/round pattern.  This 
>of course can be impacted by variations in ground resistance in the near 
>field.  Should the feedline not exit for 1/4 wave there will be some 
>interaction with the radiation patter.
>
I'm curious about this. Of course in order that the radiated RF from the 
vertical dipole does not induce undesired currents in the feedline, the 
feedling should run perpendicular to the dipole for as far as is 
practical. Is 1/4 wavelength really far enough?  At what distance is 
does the current induced in the feedline, if it were parallel to the 
intentionally radiating element, become insignificant?

In parasitic arrays aren't director elements sometimes more than 1/4 
wavelength from another element? If being that far away made interaction 
insignificant, there would be no benefit in adding that element.

DE N6KB